CN214898159U

CN214898159U - Arc extinguishing device and circuit breaker thereof

Info

Publication number: CN214898159U
Application number: CN202121124266.9U
Authority: CN
Inventors: 管瑞良; 严晓辛; 顾建青
Original assignee: Changshu Switchgear Manufacturing Co Ltd
Current assignee: Changshu Switchgear Manufacturing Co Ltd
Priority date: 2021-05-24
Filing date: 2021-05-24
Publication date: 2021-11-26
Anticipated expiration: 2031-05-24

Abstract

An arc extinguishing device and a circuit breaker thereof belong to the technical field of low-voltage electricity. The arc extinguishing chamber comprises an arc extinguishing chamber shell and an arc extinguishing grid group arranged in the arc extinguishing chamber shell, wherein the arc extinguishing grid group comprises a first grid sheet positioned at the top and a second grid sheet positioned below the first grid sheet and adjacent to the first grid sheet, the first grid sheet is provided with a first grid sheet base part, and a first arc striking angle extends from the first grid sheet base part; the second grid plate is provided with a second grid plate base part, a second arc ignition angle extends from the second grid plate base part, and the length of the first arc ignition angle is greater than that of the second arc ignition angle. A circuit breaker is equipped with the arc extinguishing device. The advantages are that: the arc striking capability of the arc extinguishing device is remarkably improved, so that the electric arc enters the arc extinguishing grid group of the arc extinguishing device more quickly, the electric arc voltage is effectively improved, the extinguishing of the electric arc is accelerated, the strong current limiting effect is realized, and the breaking performance of the circuit breaker is improved.

Description

Arc extinguishing device and circuit breaker thereof

Technical Field

The utility model belongs to the technical field of the low pressure electricity, concretely relates to arc control device to still relate to the circuit breaker that is equipped with this arc control device.

Background

The molded case circuit breaker, as a general electric appliance, plays a role of breaking and connecting a circuit in a distribution line (also called a "supply and distribution network"), and is widely used because it has a compact structure, a low price, a good operational reliability, and the like. As for the structure of the molded case circuit breaker, it generally includes a case, and an operating mechanism, a trip, an arc extinguishing device, and a contact system mounted on the case. The contact system comprises a moving contact and a fixed contact. When a fault current is generated in a circuit (i.e., the distribution line), the release operates to trigger the operating mechanism to generate a release operation, and the movable contact is opened (also referred to as "separated") relative to the fixed contact. As known in the art, when the moving contact is opened relative to the stationary contact, an arc is generated due to the separation of the moving contact and the stationary contact under the condition of current carrying, and the arc is extinguished in the arc extinguishing grid plate after entering the arc extinguishing device, so as to break the fault current.

From the above, it can be seen that: the arc extinguishing device is one of important parts of the circuit breaker because the arc extinguishing device can extinguish the arc generated by the movable and static contacts when the circuit breaker breaks fault current. In the prior art, the arc extinguishing device generally adopts a metal arc extinguishing grid to cut the arc to increase the arc voltage, and in order to improve the arc extinguishing performance or arc extinguishing capability of the arc extinguishing device, the arc needs to rapidly enter the arc extinguishing grid of the arc extinguishing chamber, so that the arc extinguishing grid can effectively cut the arc and rapidly extinguish the arc. However, it is always the endeavor of the industry to seek and meet the need to make the arc more quickly enter the arc chute of the arc extinguishing device so that it is more quickly extinguished, and the technical solutions described below are made in this context.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an arc control device that electric arc that produces when helping dividing the disconnected fault current of sound contact shifts to arc extinguishing bars piece fast and can promote arc voltage effectively and extinguish with higher speed electric arc in order to embody and improve the circuit breaker breaking performance with strong current-limiting effect.

Another task of the present invention is to provide a circuit breaker having the arc extinguishing apparatus.

The task of the utility model is accomplished like this, an arc control device, including the arc extinguishing chamber shell and install the arc extinguishing grid group in the arc extinguishing chamber shell, this arc extinguishing grid group includes a first grid piece I that is located the top and a second grid piece II that is located below the first grid piece I and is adjacent to the first grid piece I, the first grid piece I have a first grid piece basal portion I, this first grid piece basal portion I extends and has a first arc ignition angle I; the second grid II is provided with a second grid base II, a second arc ignition angle II extends from the second grid base II, and the length of the first arc ignition angle I is larger than that of the second arc ignition angle II.

In a specific embodiment of the present invention, the first grid piece i has a pair of first grid legs i, the pair of first grid legs i are located at two sides of the first grid piece base portion i, and the first arc striking angle i is located between the pair of first grid legs i; the second grid piece II is provided with a pair of second grid piece legs II, the pair of second grid piece legs II are positioned on two sides of the second grid piece base part II, and the second arc striking angle II is positioned between the pair of second grid piece legs II; the arc extinguishing chamber shell is provided with a lower shell used for coating the first grid leg I and the second grid leg II.

In another specific embodiment of the present invention, a gap is maintained between the first arc striking angle i between the pair of first grid legs i and the pair of first grid legs i; gaps are respectively kept between the second arc ignition angle II positioned between the pair of second grid legs II and the pair of second grid legs II.

In another specific embodiment of the present invention, a bending portion is formed at each end of the pair of first grid legs i away from the first grid base i, and the bending portion faces the second grid ii; the first arc ignition angle I is bent towards the second grid piece II.

In another specific embodiment of the present invention, the first arc angle i and the bending portion form a parallel relationship.

In another specific embodiment of the present invention, the second arc striking angle ii extends in the same direction as the second grid leg ii and is maintained in the same plane.

A circuit breaker is equipped with the arc extinguishing device.

In a more specific embodiment of the present invention, the movable contact device further comprises an operating mechanism, a main shaft driven by the operating mechanism, and a movable contact of a contact system driven by the main shaft, wherein the movable contact is mounted on the main shaft.

The technical scheme provided by the utility model the technical effect lie in: because first bars piece base I at first bars piece I extends and has first run-on angle I to second bars piece base II at second bars piece II extends and has second run-on angle II simultaneously, therefore arc extinguishing device's run-on ability can show the improvement, makes electric arc get into arc extinguishing bars group of arc extinguishing device more fast, effectively promotes electric arc voltage, accelerates extinguishing of electric arc, realizes strong current-limiting effect, improves circuit breaker breaking performance.

Drawings

Fig. 1 is the schematic diagram of the arc extinguishing device arranged in the circuit breaker.

Fig. 2 is another schematic diagram of the arc extinguishing device of the present invention disposed in the circuit breaker.

Fig. 3 is a schematic view of the arc extinguishing device shown in fig. 1 and 2.

Fig. 4 is a schematic view of the arc chute groups shown in fig. 1 to 3.

Fig. 5 is a schematic view of the first gate i shown in fig. 1 to 4.

Fig. 6 is a schematic view of the second gate ii shown in fig. 1 to 4.

Fig. 7 is a schematic diagram of the moving contact and arc extinguishing device of the circuit breaker of the present invention.

Detailed Description

The following detailed description of the embodiments of the present invention will be described with reference to the accompanying drawings, but the description of the embodiments by the applicant is not intended to limit the technical solutions, and any changes made according to the present invention rather than the essential changes should be considered as the protection scope of the present invention.

In the following description, all the concepts related to the directions or orientations of up, down, left, right, front and rear are based on the positions shown in the corresponding drawings unless otherwise stated, and thus should not be construed as particularly limiting the technical solutions provided by the present invention.

Referring to fig. 1 and 2, the circuit breaker includes a housing 4. The contact system 3 and the arc extinguishing device are arranged in the shell 4; the contact system 3 comprises a moving contact 31 and a stationary contact 32. When fault current is generated, the circuit breaker trips, the movable contact 31 and the fixed contact 32 trip, namely, the movable contact 31 and the fixed contact 32 are separated, electric arcs are generated on the movable contact 31 and the fixed contact 32, and the electric arcs move, enter the arc extinguishing device and are extinguished in the arc extinguishing device.

The arc extinguishing device comprises an arc extinguishing chamber shell 1 and an arc extinguishing grid group 2 arranged on the arc extinguishing chamber shell 1, wherein the arc extinguishing grid group 2 comprises a first grid piece I21 positioned at the top end part and a second grid piece II 22 positioned below the first grid piece I21 and adjacent to the first grid piece I21.

The arc extinguishing grid plate group 2 further comprises a plurality of third grid plates III 23, and the third grid plates III 23 are located on one side, far away from the first grid plate I21, of the second grid plate II 22.

A circuit breaker comprises an arc extinguishing device, a contact system 3, an operating mechanism and a main shaft; when the arc extinguishing device is installed in a circuit breaker, the first grid I21 is positioned on one side close to the movable contact 31. The movable contact 31 is mounted on said main shaft.

Referring to fig. 3 and 4, in order to array the arc chute groups 2 according to design requirements, the arc extinguishing device further comprises an arc chute housing 1, and the arc chute housing 1 is used for installing the arc chute groups 2. Specifically, the first grid piece i 21, the second grid piece ii 22 and the third grid piece iii 23 of the arc-extinguishing grid piece group 2 are all inserted into the arc-extinguishing chamber housing 1, so that the installation requirement of the arc-extinguishing grid piece group 2 is met. Of course, the arc extinguishing grid group 2 may also be fixed to the arc extinguishing chamber housing 1 by using a common fixing method such as riveting.

Specifically, in this embodiment, the arc extinguish chamber housing 1 includes a lower housing 11 (a right housing in a position state shown in fig. 3) and an upper housing 12 (a left housing in a position state shown in fig. 3), and the lower housing 11 and the upper housing 12 are spliced to form the complete arc extinguish chamber housing 1. The lower housing 11 is used to cover the grid legs of the arc extinguishing grid set 2.

Fig. 4 is a schematic diagram of the first gate i 21, the second gate ii 22 and the third gate iii 23. The first grid piece I21 and the second grid piece II 22 are arranged at intervals, namely, a gap is formed between the first grid piece I21 and the second grid piece II 22. Similarly, the second gate ii 22 and the third gate iii 23 are also spaced, and adjacent gates of a plurality of third gates iii 23 are also spaced.

Referring to fig. 5, a schematic diagram of the first gate i 21 is shown. The first grid piece I21 is made of a metal material and is sheet-shaped. The first grid piece I21 comprises a first grid piece base part I211 and first grid piece legs I212 positioned on two sides of the first grid piece base part I211. The first grid leg i 212 extends in a lateral direction, in particular towards a side of the contact system 3. A first arc ignition angle I2111 is arranged on one side of the first grid piece base I211 and between the pair of first grid piece legs I212, and the first arc ignition angle I2111 and the first grid piece legs I212 on two sides are arranged in a clearance mode. The first run-on angle i 2111 likewise extends toward one side of the contact system 3.

It should be noted that the first grid leg i 212 is not necessary, and if the first grid i 21 does not have the first grid leg i 212, it is also possible to provide a magnetic field enhancing device for enhancing the magnetic field outside the arc extinguishing device.

Preferably, the first grid leg i 212 is provided with a bending part 2121. The bending part 2121 is bent towards one side of the second grid II 22. More preferably, the first arc ignition angle i 2111 is also bent towards the second grid piece ii 22. Further, the first arc starting angle i 2111 is parallel to the bending portion 2121.

Referring to fig. 5, the first arc ignition angle i 2111 can greatly improve the arc ignition capability of the first grid piece i 21. Because the first arc ignition angle i 2111 is biased to the movable contact head 312 of the movable contact 31, the movable contact head 312 is at the arc root position of the arc. Thereby, the distance between the first grid pieces I21 is shortened, and the arc striking capability of the first grid pieces I21 is improved. The first arc ignition angle i 2111 is preferably bent at an angle of 25  to 45 , and more preferably, the first arc ignition angle i 2111 is bent at an angle of 35 . Preferably, the extension length of the first arc ignition angle i 2111 is 0.8 to 1.2 times of the length of the first grid base i 211, and more preferably, the two are equal in length.

Referring to fig. 6, a schematic diagram of the second gate ii 22 is shown. The second grid II 22 is also made of a metal material and is also sheet-shaped. The second grid II 22 comprises a second grid base II 221, and a pair of second grid legs II 222 extending are arranged on two sides of the second grid base II 221. Specifically, the second grid leg ii 222 is shaped like a long strip. A second arc starting angle II 2211 is further arranged on the second grid piece base part II 221, and the second arc starting angle II 2211 is located between the pair of second grid piece legs II 222 and is arranged in a gap mode with the pair of second grid piece legs II 222. Specifically, the second arc striking angle ii 2211 extends in the same direction as the second grid leg ii 222. The second arc striking angle II 2211 is used for attracting electric arcs and enabling the electric arcs to rapidly enter the arc extinguishing grid group 2 in the arc extinguishing chamber.

It should be noted that the second grid leg ii 222 is not necessary, and if the second grid ii 22 does not have the second grid leg ii 222, it is also possible to provide a magnetic field enhancing device for enhancing the magnetic field outside the arc extinguishing device.

Preferably, the second arc striking angle ii 2211 extends to 0.3 to 0.7 times, more preferably to 0.5 times, the length of the second grid base ii 221.

Because the first arc striking angle I2111 and the second arc striking angle II 2211 exist simultaneously in the technical scheme, the arc striking capacity of the arc extinguishing device is greatly improved, electric arcs can enter the arc extinguishing grid group 2 of the arc extinguishing device more quickly, the electric arc voltage is effectively improved, the extinguishing of the electric arcs is accelerated, the strong current limiting effect is realized, and the breaking performance of the circuit breaker is improved.

Referring to fig. 1, 2 and 7, the movable contact 31 is arranged in a swinging manner and includes a movable contact 311 and a movable contact head 312. The stationary contact 32 comprises a stationary contact 321. The movable contact 311 is matched with the fixed contact 321. When the circuit breaker is connected to a power grid, an arc is generated when the movable contact 31 is separated from the fixed contact 32, and an arc root of the arc moves to the movable contact head 312.

Because in the technical scheme that the utility model provides, first bars piece I21 have first run-on angle I2111, and second bars piece II 22 on have second run-on angle II 2211, the length of first run-on angle I2111 is greater than the length of second run-on angle II 2211, both are complementary structural style, have further strengthened the arc ignition ability.

Claims

1. An arc extinguishing device comprises an arc extinguishing chamber shell (1) and an arc extinguishing grid group (2) installed in the arc extinguishing chamber shell (1), wherein the arc extinguishing grid group (2) comprises a first grid piece I (21) positioned at the top and a second grid piece II (22) positioned below the first grid piece I (21) and adjacent to the first grid piece I (21), and is characterized in that the first grid piece I (21) is provided with a first grid piece base I (211), and a first arc striking angle I (2111) extends from the first grid piece base I (211); the second grid II (22) is provided with a second grid base II (221), a second arc angle II (2211) extends from the second grid base II (221), and the length of the first arc angle I (2111) is larger than that of the second arc angle II (2211).

2. An arc extinguishing device according to claim 1, characterized in that the first grid i (21) has a pair of first grid legs i (212), the pair of first grid legs i (212) being located on either side of the first grid base i (211), the first run-on angle i (2111) being located between the pair of first grid legs i (212); the second grid II (22) is provided with a pair of second grid legs II (222), the pair of second grid legs II (222) are positioned on two sides of the second grid base II (221), and the second arc ignition angle II (2211) is positioned between the pair of second grid legs II (222); the switching chamber housing (1) has a lower housing (11) for sheathing the first (212) and second (222) grid legs.

3. An arc extinguishing device according to claim 2, characterized in that a gap is maintained between the first ignition angle i (2111) between the pair of first grid legs i (212) and each of the pair of first grid legs i (212); gaps are respectively kept between the second arc ignition angle II (2211) positioned between the pair of second grid legs II (222) and the pair of second grid legs II (222).

4. An arc extinguishing apparatus according to claim 2, characterized in that a bent portion (2121) is formed at each of the ends of the pair of first grid legs i (212) facing away from the first grid base i (211), and the bent portion (2121) faces the second grid ii (22); the first arc ignition angle I (2111) is also bent towards the direction of the second grid II (22).

5. An arc extinguishing device according to claim 4, characterized in that the first ignition angle I (2111) is in parallel relationship with the bent portion (2121).

6. An arc extinguishing device according to claim 2, characterized in that the second arc striking angle ii (2211) extends in the same direction and in the same plane as the second grid leg ii (222).

7. A circuit breaker, characterized in that it is provided with an arc extinguishing device according to claim 1.

8. A circuit breaker according to claim 7, characterized in that it further comprises an operating mechanism, a main shaft driven by said operating mechanism, and a movable contact (31) of the contact system (3) driven by said main shaft, said movable contact (31) being mounted on said main shaft.